Safety appliance for elevators.



Patented Dec. l8, I900.

No. -664,l33.

L. m. a m. F. DUTY. SAFETY APPLIANCE FOR ELEVATORS.

(Application filed Apr. 28, 1900.) (J40 Modal.) 2 Shae is5he0t I.

l qhtmmw uail/7f No. 664,l33 Patented Dac. l8, I900.

L. M. &. M. F. DOTY.

SAFETY APPLIANCE FOR ELEVATORS.

u umion filed 4 2s, 1900.. (No lodal.) 2 Sheets-Shoat 2.

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Q/vi Luzon-a v, WASHINGTON. a. c.

nu: NORRIS PETERS c0v PnoTum-uo I UNITED STATES PATENT OFFICE.

LOUIS MARTIN DOTY AND MAURICE FORESTUS DOTY, OF AUSTIN, ILLINOIS.

SAFETY APPLIANCE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 664,133, dated December 18, 1900.

Application filed April 28,1900. Serial No. 14n'72Ov (N0 mudelfi To all whom it may concern:

Be it known that we, LOUIS MARTIN DOTY and MAURICE FoREsTUs DOTY, citizens of the United States, residing at Austin, in the county of Cook and State of Illinois, have invented new and useful Improvements in Safety Appliances for Elevators, of which the following is a specification.

This invention relates to new and useful improvements in safety appliances for elevators; and its primary object is to provide a device of this character adapted to convey the car in safety to the bottom of the shaft in the event of the breaking of the cable, machinery, (be.

. A further object is to provide a device of simple construction which may be applied to elevators ordinarily used.

To these ends the invention consists in the novel construction and combination of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawings, showing the preferred form of our invention, and in which- Figure 1 is a view of the device, partly in section and partly in elevation; and Fig. 2 is a plan view thereof. Fig. 3 is a side elevation showing the device applied to an elevator-car, the cylinder being partly broken away. Fig. 4 is an end view thereof.

A cylinder 1, having both ends closed, is secured to the bottom of the car in any desired manner and has a piston therein, the rod 2 of which is secured at its outer end to a cross-head 3, slidably mounted between guides 4, which are suspended from the car. Projecting forward from the cross-head are two pivoted jaws 5, which are normally held in closed position by means of springs 6. Secured within the elevator-shaft and extending the full length thereof are one or more racks 7, each of which is adapted to be engaged by a gear 8, mounted upon a shaft 9, secured to the car. This gear is connected by means of a pitman 10 to a cross-head 11, which is also slidable upon the guides 4. A

slot 12 is formed within one end of this crosshead, and a dog 13 is pivoted therein and provided with a spear-shaped head 14:. This dog is held at any desired inclination by means of a set-screw 15.

Projecting from the dog, near the lower end thereof, is a shoulder 16, adapted to engage a catch 17 when said dog is swung forward into a horizontal position. This catch is secured to the bottom of the cross-head 11 and is preferably of the form shown in Fig. 1, the same being held in normal position by means of a spring 18.

The cross-head 3 is preferably connected by means of a chain 19 to a lever 20, pivoted in any suitable manner and adapted to be operated from the car.

It will be seen that when the car moves up and down within the shaft the safety appliance is carried therewith, causing the gear 8 to revolve because of its engagement with the rack 7. This movement of the gear will cause the cross-head 11 to reciprocate upon the guides 4, and it is obvious that the greater the speed of the car the faster will be the reciprocation of the cross-head 11.

By means of the set-screw 15 the dog 13 can be set at such inclination as to permit the same to be thrown past the vertical center thereof when the car attains a predetermined speed.

It will be seen that when the dog has been swung forward into a horizontal position by the rapid reciprocation of the cross-head said dog will be held in such position by the catch 17, which engages the shoulder 16. It is obvious that upon the first forward stroke of the cross-head with the dog in this position said dog will be forced between the jaws 5 and the same will be sprung into engagement therewith. Upon the return stroke of the cross-head 11 the cross-head 3 and the piston 2 will be drawn therewith, and said piston will reciprocate with the cross-head until the car reaches the bottom of the shaft, the air within the cylinder 1. serving as a cushion to retard the revolution of the gear 8.

The car may be stopped at any point when the cross-headsare coupled by drawing upon the lever 20, which will limit the movement of the cross-heads and prevent a complete revolution of the gear.

In the foregoing description we have shown the preferred form of our invention; but we do not limit ourselves thereto, as we are aware that modifications may be made therein without departing from the spirit or sacrificing the advantages thereof, and we therefore reserve the right to make such changes and modifications fairly fall within the scope of our invention.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a device of the character described, the combination with a cylinder having a piston therein, of jaws secured to said piston, a cross-head, means for reciprocating the crosshead, and a dog upon said cross-head and adapted to be thrown into engagement with the jaws.

2. The combination with a rack, of a gear meshing therewith and movable thereon, a dog reciprocated by the revolution of the gear, a cylinder, a piston therein, and jaws secured to the piston adapted to be engaged by the dog.

3. The combination with a rack, of a gear movable thereon, guides, a cross-head mounted thereon, and reciprocated by the gear, a dog pivoted in the cross-head and means for holding said dog in a horizontal position.

4. The combination with a rack, of a gear, a cross-head, guides therefor, said cross-head adapted to be reciprocated by the movement of the gear, a dog pivoted within the crosshead, means for holding the dog at a desired inclination and a catch.

5. The combination with a rack, of a gear, a cross-head, guides therefor, said cross-head adapted to be reciprocated by the movement of the gear, a dog pivoted within the crosshead and having a spearshaped head, means for supporting the dog at a desired inclination, a shoulder upon the dog, and a catch, adapted to be engaged by said shoulder and to lock the dog in a horizontal position.

6. In an elevator safety appliance, the combination with a cylinder having a piston therein, of a dog reciprocated by the movement of the elevator-car to which it is attached, and adapted to be thrown into engagement with the piston when such reciprocation reaches a predetermined speed.

7. In an elevator attachment of the character described, the combination with a cylinder and a piston therein, of a cross-head secured to the piston, jaws thereto, and a dog reciprocated by the movement of the elevatorcar to which it is attached, and adapted to be thrown into engagement with said jaws when such reciprocation reaches a predetermined speed. i

8. The combination with a cylinder having a piston therein, a cross-head secured thereto, and spring-controlled jaws projecting therefrom; of guidesfor said cross-heads, a

second cross-head mounted upon the guides, a dog pivotally mounted within said crosshead, means for reciprocating the cross-head upon the guides and automatically engaging the dog with the jaws.

9. The combination with a rack, of a gear engaging therewith, guides, a cross head mounted thereon, a pitman connecting the gear and cross-head, a dog pivoted within the cross-head, a cylinder, a piston thereto, and jaws slidably mounted upon the guides and adapted to be engaged by the dog.

10. In an elevatorsafety appliance, the combination with guides secured to an elevatorcar; of cross-heads slid-ably moun ted thereon; a cylinder,a piston secured to one of the crossheads, and movable within the cylinder; and means operated by the movement of the elevator for automatically coupling the cross heads.

11. In an elevator safety appliance, the combination with guides secured to an elevatorcar; of cross-heads slidably mounted thereon; a cylinder, a piston secured to one of the cross heads and movable within the cylinder; jaws pivoted to one crosshead; a dog pivoted to the second cross-head; and means operated by the movement of the elevator-car, for automatically coupling the dog and jaws when such movement reaches a predetermined speed.

12. The combination with a cylinder havinga piston therein; of a dog reciprocated by the movement of an elevator-car and adapted to be thrown into engagement with the piston when such reciprocation reaches a predetermined speed.

13. In a device of the character described, the combination with a cylinder having apiston therein; of a cross-head; guides therefor; a dog pivotally mounted within the crosshead; and means for reciprocating the crosshead upon its guides and automatically ongaging the dog with the piston, when such reciprocation reaches a predetermined speed.

14. The combination with a reciprocating cross-head; of a dog pivotally mounted upon said cross-head means for supporting the dog at any desired inclination; a shoulder upon the dog; and a catch adapted to be engaged by said shoulder and to lock the dog.

In testimony whereof we affix our signatures in presence of two witnesses.

LOUIS MARTIN DOTY. MAURICE FORESTUS DOTY. IVitnesses O. P. SMITH, JOHN E. LEE. 

